Engine-lock



G. KOCH.

ENGINE LOCK.

APPLICATION 'FILED MAY 3. |919.

Patented sept. 7, 1920.

lill Sylilgi ljtlll GOTTHARDT KOCH, CICGO; ILLNIS.

I ENGINE-Loon.

fggfr, Speccation of Letters Patent. Patient-gd Sept' I7 1%20.

Application filed.v May 3, 1919.

To ZZ 207mm t may Concern lle it known that l, Gorriinnu'r Kooi-I, a citizen of Germany, residing at Chicago, in the county of Cook and State of illinois,

have invented certain new and useful lmtween the carburetor and intake manifold of Y an internal combustion engine to control the passage of explosive mixture to the cylinders.

further object is the provision of a key controlled valve operative in normal position to obstruct the passage' of explosiveinixture from the carburetor to the cylinners ofthe engine, and which may be moved by the suction of the engine pistons to a position in the intake conduit where it permits the ordinary flow of mixture from the carbureter to the cylinders. A further object is the provision of such a valve in combination with a key controlled lock whereby the valve may be held in normal, obstructing position. l

Other objects and advantages of the invention will appear from the following description, taken in conjunction withV the accompanying drawings which form a part of this speciicationand illustrate the preferred embodiment of the invention.

ln the drawings:

Figure 1 is a front-elevation of the invention showing the saine inserted 1in series in the conduit for explosive mixture for the internal combustion engine, the upper broken portion of the carburetor' pipe being shown at the lower extremity of this figure, and the intake manifold of the engine appearing in the upper portion.

Fig. 2 is a vertical, approximately central section of the invention showing the parts in the position they assume when the engine is locked against operation.

F ig. 3 is a similar view showing in full lines the unlocked position of they parts and in dotted lines ther position of the valve during the operation of the engine.

Reference numeral 1Q indicates the 'upper extremity of a carbureter chamber through which explosive mixture is drawn to the cylinders of an internal combustion engine, while numeral 11 designates the lower exo Serial No. 294,420.

11 l insert a substantially cylindrical fitting generally indicated at 13 and comprising a lower tubular portion 14 preferably of the saine bore as the carbureter chamber lOaIid enlarged in bore in its upper portion as at 15, an inclined shoulder 16 forming the inner surface of lit-ting 18 between the lower and upper portions 14 and 15.

A yoke 17 spans the opening of fitting 13 at the upper end thereof and carries centrally a vertically apertured boss 18 which forms the bearing for a guide rod 19 on the lower end of which is rigidly carried a valve 21. The valve 21 comprises a piston shaped cup having its cavity uppermost and defined by the side wall 22. Between yoke 17 and valve 21 is compressed a helical spring 23 which exerts downward pressure upon the valve holding it normally in the position shown in Fig. 2, wherein the valve is contained entirely within the lower, smaller bore portion 1.4i of the fitting and prevents the passage of explosive mixture to the engine cylinders. By means of a head 24 carriedon the upper end of guide rod 19, the guide rod and valve are limited on their downward movement. n

A lock casing 25 is formed integrally at the right hand side of Vfitting 13 and is chambered as at 26 to contain any suitable key-operated lock. The details of this lock are not herein shown or described as its particular construction forms no part of theV slot 28 formed in the outer endof a valvek locking bolt 29, the bolt being horizontally slidable in fitting and being normally pressed to position its inner end 31 above the wall 22 of valve 21 by means of an expansion spring 32 interposed between the outer end of the bolt and the opposite Y 27 is caused to swing about the axis of chainber 26 by means of a key (not shown) but adapted to be inserted in the key hole 33 in the lock above mentioned, said lock being generally indicated as to location by reference numeral 3l in Fig. 1.

The lower surface of bolt 29 is vhorizontal and, by overlying the upper edge of wall 22 of the valve prevents the valve from rising under the influence of the engine suction. The inner extremity S1 of bolt 29 further- Ymore is beveled to provide an inwardly and `wall of the casing T he crank pin iio upwardly exposed cam surfaceV 35, the inner end of the bolt being wedge shaped. The" outer side of wall 22 of the valve'is recessed oppositebolt 29 to form an upper cam sur-.

face 36 steeply pitched from the vertical and a lower cam surface 37 pitched only' slightly Vfrom the vertical. Upon suitable manipulation of the valve the bolt 29 isI adapted to seat withinY the side recess of wall 22, as shown in full lines in Fig. 3. The lower e lge of valve 21 is beveled as at 38, Vand is adapted to ride upon a cam surface 39 formed on the inner end of a push rod 41 guided in fitting 13 for horizontalA movement toward and from the pluo. An externally threaded nipple 42 projects to the left hand Vfrom fitting 13 atabout the level of the valve 21 when the latter is inl its normal` position. centrally apertured .cap 43 is threaded about this nipple and forms, with the iitting, a bearing for the horizontal movement of the push rod 41. .'A flange 44 is fixed about push rod V4l liust within' cap 43, and a spring interposed between flange and casting 13,

against operation because the presence ofl the valve 2l inV portion 14 of the fitting prevents passage of explosive mixture from the carbureter to the engine cylinders; the operator inserts his key in the key hole 33 and manipulates lock 34 fto' swing crank pin 2T so as to withdraw the locking` bolt 29 from its position above the valve. rThe action-of spring 23 still holds the valve in theV position'of Fig. 2; The operator now applies his thumb to push rod 41 thrustingit inwardly to bring its cam surface 39against the bevel 38 of the valve, this inward',inove-` ment of the thrust rod continuing` to the dotted line position of Fig. 3. rides upwardly on the cam surface 39 of the push rod into the full line position. ofV

Fig. 3, whereupon the operator releases his holdV upon the lock key and permits springl 32 to thrust the locking boltY 29 into the rrecess 36-37 of the valve wall 22.4 The Vrelative pitch or slant of surface 36 of the valve and 35 of the locking bolt is such thatthe bolt retains the valve in this unlocked and slightly elevated position against the downward pressure'of' springV 23. The operator now removes his thumb from push rod 41 and spring 45. returns this rod to its The valve spring 23'; tlie surface 37 acting as a cam surface in thrusting` the locking` bolt 29 slightly outwardly till its inner extremity 31 bears against the vertical side of the valve during the suction induced elevation of the latter. In the upper dotted line posi tion of the valve, as illustrated in Fig. 3, the valve is contained entirely within the upper b ore 15 of the iitting 13, this upper bore being of vmuch larger diameter than,

the valve, while the lower bor i4 of the fitting substantially equals the diameter ot the valve. In this upper Yposition of the valve, its bottom is spaced considerably Yabove the upper extremity of the lower bore 14l of the fitting so that explosive mixture may now pass freely from the carbureter 10 to the intake manifoldV 11. As long as the engine operates the valve is held in this upper position by reason of the suctionof the pistons; but when the engine stops, the

cessation of suction releases valve 21 'to the .action of spring 23,7so that the `*valve ref turns tothe full lineposition of Fig. 2Y and the' upper edge ofy wall 22 passes below bolt 29.

When the valve is thus depressed, spring 32 throws bolt 29'above the upper edge of wall 22 of the'valve, thus locking the Vengine against operation vby returning` the parts to theirL- normal position as shown in Fig. 2. In this returnl of the valve to normal position, the speed of the valvefs movement provents the locking bolt 29 from seatagainst surface 36 in the wall of the valve. In the unlocked position of the valve, ,as illustrated in Fig. 3therelative slant of surfacesl 36 of the valve and 35 ofthe locking bolthowever is such as to hold the valve against the force of spring 23 which tends to further depress the valve. Y Y

In order to prevent leakage of air through the key hole 33, chamber 26, and about locking bolt 29l to the interior of fitting 13, the key hole is sealed by means of a cover 48 hinged as at`49 on the casing 25, this cover being, by any suitable means not shown, held againstthe outer extremity of the lock 34v to prevent passage of air through thek key hole 33 while the engine is operating..

While I have shown fitting 13 as a sepai rate element it will be noted that the ing vention may be incorporated in aV suitably formed intake manifold. It is also noted, that when the parts are in the position of Fig. 2, the engine islocked againstopera tion by any unauthorized person; it being flic.

'iis

essential that one desiring to run the engine must have a key for the lock 34 before bolt 29 can be withdrawn from its position in the path of movement of the valve.

TWhile I have illustrated and described the preferred embodimentl of my invention, it will be obvious that one skilled in the art may make modications thereof Without departing from the spirit of the invention. 1 wish, therefore, not to be restricted 'to the precise embodiment shown except in so far as the same is limited in the appended claims. s

l claim:

l. 1n an internal combustion engine, the

. combination with an intake manifold fitting,

of a device associated therewith and spring pressed to a position wherein it obstructs passage of fluidthrough the manifold, said device being mounted for suction induced movement to a'position wherein-it permits passage of fluid, and a key controlled lockoperated bolt mounted for actuation linto the path of movement of said device to prevent, at will, the movement of the device from its obstructing position.

2. ln an internal combustion engine, the combination with an intake manifold fitting having an upper large bore and a lower small bore, of a valve slidably fitting the smaller bore of the fitting and mounted for suction induced movement therefrom into said large bore, and a key-controlled locking bolt positioned for movement into and out of the path of movement of the valve.

3. 1n an internal combustion engine, the combination with an intake manifold fitting having an upper large bore and a lower small bore, of a valve slidably fitting the smaller bore of the fitting and mounted for suction induced movement therefrom into said large bore, a key controlled locking bolt positioned for movement into the' path of movement of the'valve, and a spring posi- Y tioned to move said valve normally into the small bore of the fitting.

e. In an internal combustion engine, the combination with an intake manifold fitting having juxtaposed alined small and large bores, of a valve slidably fitting said small bore and mounted in the fitting for movement into said large bore, said movement being in a direction toward the cylinders of the engine, spring of lesser strength than the engine suction exerting pressure against the valve to move it normally into the smaller bore of the fitting, and key-controlled means for holding the valve in said small bore of the fitting.

5. rlhe combination with the intake manifold of an internal combustion engine, said manifold having its axis substantially vertical, of an intake manifold fitting provided with an upper large bore near the engine cylinders and a lower small bore remote from said cylinders, avaive guided within the fitting for axial movement from one vof said bores to the other, and key-operated means for locking the valve within said small bore, said valve being arranged to be opened by engine suction.

6. The combinationwith the intake mani' bolt movable to a position wherein'it bears4 against the upper surface of said valve, said valve being arranged to be opened by engine suction. s

7. The combination with the intake manifold of an internal combustion engine, of an intakermanifoldfitting therefor having large bore near the cylinders of the engine', and, alined therewith, a small bore remote from said cylinders, a valve for the small bore guided for movement within the fitting and into the large bore thereof, a spring of lesser strength than the manifold suction positioned to move the valve into the small bore, a locking bolt mounted in the fitting for movement against the valve to arrest travel thereof from the small bore, a second spring positioned to move the bolt normally into said valve arresting position, and key operated means for withdrawing said locking bolt from the latter position.

8. 1n an internal combustion engine, the combination with the intake manifold thereof, of an intake manifold fitting therefor having. a large bore near the cylinders of the engine and a small bore remote from the cylinders, a valve slidable axially of the fitting into the large bore thereof, a valve spring of less strength than the engine suction normally holding the valve within the small bore, a locking bolt slidably mounted in the fitting formovement in a direction angled with respect to the axis of the fitting to prevent movement of said valve from the small bore of the manifold, the outer periphery of said valve being recessed to provide adjacent beveled surfaces, one of said surfaces near the engine cylinders standing at a large angle with respect to such axis, said bolt having its innerV edge wedge-shaped for insertion in said peripheral recess anni4 against said bevel surfaces, key controlled means for withdrawing the bolt from the path of movement of the valve, a second spring positioned to move the bolt normally into the path of movement of the valve, and a thrust rod operable from without` the manifold and shaped and positioned to strike and move the Valve axially of the Y fitting and in a direction toward the Vengine cylinders. Y

9. In an internal combustion engine, the

combination with the intake mani-fold thereof, Vof an intake manifold itting therefor having a vlarge bore near the cylindersv ot the engine and a small bore remote troni the cylinders, a valve for the small bore slidable Vof said valve fromV the small bore ot the manifold, the outer periphery of said valve being recessed'to provide adjacent beveled surfaces, one of said surfaces near the engine cylinders standing at a large angle with respect to the axis of the fitting andthe other beveled surface remote troni the Vengine cylinders standing at a slight angle with respectto such axis, said bolt having its inner edge Wedge-shaped torinsertion in said peripheral recess and against said beveled surfaces, key controlled means 'for Withdrav ing the bolt-from the path of movement vof the valve, a second Vspring positioned to move the bolt normally into the path ot movement ot the valve,` and a thrust rod" operable from Without the fitting and shaped and positioned Vto-strike and move the valve axially of the fitting and in a direction toward the engine cylinders, 'said peripheral recess being positioned at that extremity of the valve nearer the engine cylinders and having that one oi' its bevels lying nearer Ysaid cylinders so related to the adjacent Wedge surface off the locking boltas to prevent relative movement ofA the valve and locking bolt under the iorce oi the valve spring. Y p

In testimony whereof/I have aflixed my signature. Y

GoTTi-IARDT Kooii. 

